Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f2db435b523df7…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 14:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5d8b329fab816d74460900c6efe9b405 SHA-1: 98857927578891bd9b47f3b25c8ae1ce8b5f4e13 SHA-256: f2f2db435b523df7f6d3d863b8356e8fb3c62e58a398dcc4a489425831bbc0af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging social engineering to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/123?utm_term=how+to+paint+trees+leaves PDF link annotation
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/c94f283b.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/lelazarutexakovosi.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/el_poder_del_pensamiento_tenaz_normagwask.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/ibGsGYZ/xajerowitiluge.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/iTihgHU/tekutoromekogomimuluvimu.pdfIn PDF document text
    • http://agreevudb.rest/world_time_magazine_20204q5i4.pdfIn PDF document text
    • http://pedron.fun/high_performance_liquid_chromatography_principley47ik.pdfIn PDF document text
    • http://doxugivo.22web.org/84219297908.pdfIn PDF document text
    • http://olymptrade.buzz/96699441295mly2g.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/ksigdgi/54790942770.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hjFJokr/top_warship_games_pc.pdfIn PDF document text
    • http://sigipotewal.22web.org/how_to_tie_a_silk_kimono_robe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubimefiz.epizy.com/clash_of_clans_apk_mod_offline.pdfIn PDF document text
    • http://xeravujowa.epizy.com/baby_einstein_jumper_instruction_manual.pdfIn PDF document text
    • http://fiwixowu.rf.gd/homeschool_math_distributive_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/which_2_bones_form_the_hard_palate.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/spectre_performance_air_intake_system_reviews.pdfIn PDF document text
    • http://zasegusof.epizy.com/80251351832.pdfIn PDF document text
    • http://kanisal.epizy.com/android_studio_language_injection_settings.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 4924 bytes
SHA-256: 5842409a9ba3eebbdf1129d240015d4af339750009a11e5a04a6ada9c608f3be
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10500 bytes
SHA-256: d63fbdebad6f17f93dfb54fdc41c27a90da051b2f43a93e6f09fed57b8777b4e

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